Montigo R320-ST - Manual (Page 11)

Step 3. As shown in Figure 4; Use Cement Board, supplied by
Montigo, to overlap the new 2 x 4's and Non-combustible Header
(front & rear face). Attach on all sides of the glass, allowing 1/8"
clearance from the rim of the fireplace opening. Top piece attaches
to non combustible header and fireplace. Bottom piece attaches to
fireplace and combustible horizontal framing member. Side pieces
attach to vertical 2x4s.
Step4. As shown in Figure 5; Cut standard Drywall / Wall board to
complete the installation of Both surrounds.
Figure 4 Sec.3 Non-combustible Cement Board the Fireplace, (supplied by Montigo) Both Sides Typical.
Combustible Drywall / Wallboard
or Equivalent (Top, Bottom & Sides)
Figure 5 Sec.3 Fireplace installation (Cut the remainder of Drywall / Wall board to complete the fireplace surrounds) Both Sides Typical.
Non-Combustible cement board,
(Supplied by Montigo) or Equivalent
Pre-drill for sheet metal screws to fasten
cement board to framing
Pre-drilled holes Top and Bottom using template for sheet meta
screws to fasten cement board to unit using previous screw holes
Sheet metal screws to attach Non-Combustible
Cement board to Steel header, (supplied by Montigo)
Clearance required
for expansion of the
fireplace when
in operation Height
Fasten Cement Board to Non-Combustible
Header using sheet metal screws and Unit,
using screws removed in step 1 (see figures 1
and 2 in Section 3 on page 10).
Fasten Cement Board to Unit, using screws
removed in step 1 (see figures 1 and 2 in
Section 3 on page 10), and to combustible
cross members.
Fasten Cement Board to Unit, using screws
removed in step 1 (see figures 1 and 2 in
Section 3 on page 10), and to combustible
cross members.
Fasten cement board to unit using
screws removed from unit existing
screw holes, and predrilled holes
using sheet metal screws.
Note: Images are shown without screens for
clarity purposes. However, your fireplace should
not be operated without proper installation of
screens.
R320-ST & R420-ST Power Vent Indoor Gas Fireplace
Page 11
XG0774 - 150121
Installation